crust ##ace ##ans , lobster ##s have a hard ex ##os ##kel ##eto ##n which they must shed in order to grow , in a process called ec ##dy ##sis ( mo ##ult ##ing ) . this may occur several times a year for young lobster ##s , but decreases to once every 1 – 2 years for larger animals . the first pair of pere ##io ##pods is armed with a large , as ##ym ##metric ##al pair of claws . the larger one is the " crush ##er " , and has rounded nod ##ules used for crushing prey ; the other is the " cutter " , which has sharp inner edges , and is used for holding or tearing the prey . usually ,
crustaceans, lobsters have a hard exoskeleton which they must shed in order to grow, in a process called ecdysis ( moulting ). this may occur several times a year for young lobsters, but decreases to once every 1 – 2 years for larger animals. the first pair of pereiopods is armed with a large, asymmetrical pair of claws. the larger one is the " crusher ", and has rounded nodules used for crushing prey ; the other is the " cutter ", which has sharp inner edges, and is used for holding or tearing the prey. usually,